To correctly and effectively select flow measurement methods and instruments, you must be familiar with both the instrument and the characteristics of the flowmeter you are using, and also consider the
Economic factors. Summarized there are five factors, namely performance requirements, fluid characteristics, installation requirements, environmental conditions and costs.
1. Considerations for performance requirements: After the measurement method is determined, the considerations for selecting the instrument in terms of performance requirements are: measurement flow (instantaneous flow
Quantity) or Total (Accumulating Flow), Accuracy, Repeatability, Linearity, Flow Range and Range, Pressure Loss, Output Signal Characteristics, and Ringing
Should be time and so on.
2. Fluid properties considerations: After the initial selection of the measurement method by fluid type, etc.
Detailed parameters and properties of fluid properties further consider the suitability of the selected solution. In addition to the fluid type, it is usually based on the instrument.
Table type characteristics consider the fluid temperature, pressure, density, viscosity and lubricity, corrosive and abrasive, etc.
. Some measurement methods also need to consider the specific parameters of fluid properties, such as the use of electromagnetic flow meters to understand the conductivity of liquids.
3. Installation considerations: Measurement methods for different principles of flowmeters vary greatly in installation requirements. For example, some instruments (such as differential pressure, turbine type) need to
Long upstream straight sections are required to ensure that the flow at the inlet of the instrument is fully developed, while other instruments (such as volumetric and float) do not have this
The requirements or requirements are very low. Some instrument manuals do not specify that the instrument should consider the installation position and flow direction, maintenance space, installation direction, etc.
Claim. However, numerous data indicate that the measurement performance of the flow meter is greatly affected by the installation conditions. Investigate the reasons why flow meter application is not good
A large part of it is due to poor installation.
4. Considerations for environmental conditions: The conditions surrounding the instrument and its expected changes should be considered in the selection process. These factors are: ambient temperature
, humidity, safety, and electrical interference.
5. Economic considerations: Economic considerations only consider the purchase cost of the instrument is not comprehensive, but also should investigate other costs, such as attachment purchase costs, installation
Commissioning fees, maintenance and regular flow calibration fees, operating costs and spare parts fees. Http://
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